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MA: Fachverband Magnetismus
MA 47: Altermagnets III
MA 47.5: Vortrag
Freitag, 21. März 2025, 10:30–10:45, H20
P-wave magnetism and spin symmetries — •Anna Birk Hellenes1, Tomáš Jungwirth2,3, Rodrigo Jaeschke-Ubiergo1, Atasi Chakraborty1, Jairo Sinova1,4, and Libor Smejkal1,2,5,6 — 1JGU Mainz — 2Czech Academy of Sciences — 3University of Nottingham — 4Texas A&M University — 5MPI-PKS — 6MPI-CPfS
The recent discovery of altermagnets was enabled by an unorthodox symmetry toolbox, crystallographic spin groups, allowing for the rigorous delineation of all collinear spontaneous exchange symmetry breakings. This raises a question: are further magnets with hitherto unknown symmetries and electronic structures hiding in plain sight? Our contribution will start with a brief history of a century-long debate on whether p-wave magnetic orders can exist. We will resolve this debate by demonstrating p-wave magnetism using the spin group formalism. We show that a collinear p-wave order arises in coplanar magnets for a subclass of noncentrosymmetric, noncollinear magnets with a combined translation and time-reversal symmetry. Contrary to common assumptions, we establish that such magnets can display non-relativistic spin-split electronic band structures. We demonstrate that these splittings preserve time-reversal symmetry, starkly contrasting splittings in ferromagnets and altermagnets, which break it. With first-principles calculations and symmetry analysis, we predict large, non-relativistic spin-splittings of several hundred meV and identify more than 40 realistic material candidates. Our work opens a wide range of possibilities for studying p-wave magnetism and using it for spintronics and topological physics. arXiv:2309.01607v3
Keywords: p-wave magnetism; spin symmetries; odd-parity-wave magnetism; noncollinear magnetism; spintronics